i have a k 32 o/u 12 ga. bbl. with a full set??? { 8 in all } of screw in chokes by stan baker. was told that this bbl. is a big bore bbl. what ever that means. does this bbl. have a higher value than a k 32 bbl. with factory choke. bbl is 28 in. could anyone put a value on this bbl. which is in excellant condition ?? al dulude